package training;

import java.util.Scanner;

public class Day42_01 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String s = in.nextLine();
            char[] chars = s.toCharArray();
            StringBuilder sb = new StringBuilder();
            for(char ch : chars){
                if(ch >= '0' && ch <= '9'){
                    sb.append(ch);
                }
            }
            System.out.println(sb);
        }
    }
}
